program: syz_mount_image$udf(&(0x7f0000000180), &(0x7f0000000100)='./bus\x00', 0x1014494, &(0x7f00000002c0)={[{@iocharset={'iocharset', 0x3d, 'iso8859-4'}}, {@partition={'partition', 0x3d, 0x6}}, {@gid_forget}, {@session={'session', 0x3d, 0xfe8}}, {@noadinicb}, {@anchor}, {@uid_forget}]}, 0xfe, 0xc24, &(0x7f0000001480)="$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") r0 = open(&(0x7f0000000240)='./file1\x00', 0x145142, 0x0) ftruncate(r0, 0x2007ffc) sendfile(r0, r0, 0x0, 0x800000009) r1 = open(&(0x7f0000000000)='./bus\x00', 0x60142, 0x0) r2 = open(&(0x7f0000000080)='./bus\x00', 0x107382, 0x1d0) getsockopt$sock_cred(r0, 0x1, 0x11, &(0x7f0000000140)={0x0, 0x0}, &(0x7f00000001c0)=0xc) ioctl$FS_IOC_GET_ENCRYPTION_PWSALT(r1, 0x40106614, &(0x7f0000000200)) r4 = openat$sndseq(0xffffffffffffff9c, &(0x7f0000000180), 0x0) ioctl$SNDRV_SEQ_IOCTL_UNSUBSCRIBE_PORT(r4, 0x40505331, &(0x7f0000000540)={{0x0, 0xf3}, {0x18, 0x81}, 0x8008, 0x5, 0xff}) quotactl$Q_SETQUOTA(0xffffffff80000801, &(0x7f00000000c0)=@nullb, r3, &(0x7f00000003c0)={0x7, 0x25d023e3, 0x6, 0x7, 0xc3, 0x0, 0x100000000, 0x4, 0x9}) ftruncate(r2, 0x2007ffb) sendfile(r1, r2, 0x0, 0x1000000201005) open(&(0x7f0000000180)='./bus\x00', 0x14937e, 0x111) symlink(&(0x7f0000000040)='./file0\x00', &(0x7f0000000280)='./file0\x00') [ 99.738116][ T5298] Bluetooth: hci0: command tx timeout [ 99.756043][ T10] cfg80211: failed to load regulatory.db [ 100.005479][ T5318] loop0: detected capacity change from 0 to 2048 [ 100.052060][ T5318] UDF-fs: error (device loop0): udf_read_tagged: read failed, block=2362, location=2362 [ 100.068639][ T5318] UDF-fs: error (device loop0): udf_read_tagged: tag checksum failed, block 99: 0x27 != 0x4d [ 100.084679][ T5318] UDF-fs: error (device loop0): udf_read_tagged: tag checksum failed, block 160: 0xd2 != 0xd4 [ 100.102112][ T5318] UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2022/11/22 14:59 (1000) [ 100.116168][ T24] audit: type=1800 audit(1772795403.481:2): pid=5318 uid=0 auid=4294967295 ses=4294967295 subj=unconfined op=collect_data cause=failed(directio) comm="syz.0.0" name="file1" dev="loop0" ino=1346 res=0 errno=0 [ 100.318710][ T5318] [ 100.319962][ T5318] ============================================ [ 100.322836][ T5318] WARNING: possible recursive locking detected [ 100.326533][ T5318] syzkaller #0 Not tainted [ 100.329206][ T5318] -------------------------------------------- [ 100.332421][ T5318] syz.0.0/5318 is trying to acquire lock: [ 100.335056][ T5318] ffff888034942d28 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_free_blocks+0xaaf/0x1940 [ 100.340116][ T5318] [ 100.340116][ T5318] but task is already holding lock: [ 100.343342][ T5318] ffff888034942d28 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_new_block+0x104a/0x1c70 [ 100.347271][ T5318] [ 100.347271][ T5318] other info that might help us debug this: [ 100.350572][ T5318] Possible unsafe locking scenario: [ 100.350572][ T5318] [ 100.353918][ T5318] CPU0 [ 100.355498][ T5318] ---- [ 100.357165][ T5318] lock(&sbi->s_alloc_mutex); [ 100.359447][ T5318] lock(&sbi->s_alloc_mutex); [ 100.361759][ T5318] [ 100.361759][ T5318] *** DEADLOCK *** [ 100.361759][ T5318] [ 100.365536][ T5318] May be due to missing lock nesting notation [ 100.365536][ T5318] [ 100.369395][ T5318] 4 locks held by syz.0.0/5318: [ 100.371547][ T5318] #0: ffff88801235c420 (sb_writers#12){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 [ 100.375955][ T5318] #1: ffff888047997b70 (&sb->s_type->i_mutex_key#25){+.+.}-{4:4}, at: udf_file_write_iter+0x6f/0x6b0 [ 100.380894][ T5318] #2: ffff8880479979a0 (&ei->i_data_sem#2){++++}-{4:4}, at: udf_map_block+0x2a4/0x4330 [ 100.385366][ T5318] #3: ffff888034942d28 (&sbi->s_alloc_mutex){+.+.}-{4:4}, at: udf_new_block+0x104a/0x1c70 [ 100.390082][ T5318] [ 100.390082][ T5318] stack backtrace: [ 100.392950][ T5318] CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 100.392970][ T5318] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 100.392977][ T5318] Call Trace: [ 100.392985][ T5318] [ 100.392991][ T5318] dump_stack_lvl+0xe8/0x150 [ 100.393015][ T5318] print_deadlock_bug+0x279/0x290 [ 100.393032][ T5318] __lock_acquire+0x253f/0x2cf0 [ 100.393048][ T5318] ? __pfx___schedule+0x10/0x10 [ 100.393460][ T5318] lock_acquire+0xf0/0x2e0 [ 100.393471][ T5318] ? udf_free_blocks+0xaaf/0x1940 [ 100.393487][ T5318] __mutex_lock+0x19f/0x1300 [ 100.393500][ T5318] ? udf_free_blocks+0xaaf/0x1940 [ 100.393516][ T5318] ? preempt_schedule_thunk+0x16/0x30 [ 100.393526][ T5318] ? __lock_acquire+0x6b5/0x2cf0 [ 100.393536][ T5318] ? udf_free_blocks+0xaaf/0x1940 [ 100.393552][ T5318] ? __pfx___mutex_lock+0x10/0x10 [ 100.393566][ T5318] ? folio_mark_accessed+0x442/0x8c0 [ 100.393586][ T5318] udf_free_blocks+0xaaf/0x1940 [ 100.393608][ T5318] ? bdev_getblk+0x582/0x6e0 [ 100.393619][ T5318] ? udf_get_fileshortad+0x6e/0x1b0 [ 100.393632][ T5318] ? udf_current_aext+0x698/0xb30 [ 100.393640][ T5318] ? __pfx_udf_free_blocks+0x10/0x10 [ 100.393652][ T5318] ? udf_next_aext+0x447/0x530 [ 100.393662][ T5318] udf_delete_aext+0x4fb/0xbd0 [ 100.393672][ T5318] ? __pfx_udf_delete_aext+0x10/0x10 [ 100.393680][ T5318] ? udf_next_aext+0x447/0x530 [ 100.393691][ T5318] udf_new_block+0x149e/0x1c70 [ 100.393711][ T5318] ? bdev_getblk+0x582/0x6e0 [ 100.393722][ T5318] ? __pfx_udf_new_block+0x10/0x10 [ 100.393743][ T5318] udf_map_block+0x1375/0x4330 [ 100.393768][ T5318] ? __pfx_udf_map_block+0x10/0x10 [ 100.393783][ T5318] ? rcu_is_watching+0x15/0xb0 [ 100.393803][ T5318] ? do_raw_spin_unlock+0x4d/0x210 [ 100.393815][ T5318] __udf_get_block+0x52/0x250 [ 100.393827][ T5318] __block_write_begin_int+0x6c6/0x1910 [ 100.393843][ T5318] ? __pfx_udf_get_block+0x10/0x10 [ 100.393853][ T5318] ? __pfx___block_write_begin_int+0x10/0x10 [ 100.393866][ T5318] ? __pfx_udf_get_block+0x10/0x10 [ 100.393876][ T5318] block_write_begin+0x8d/0x120 [ 100.393887][ T5318] ? udf_write_begin+0x92/0x270 [ 100.393902][ T5318] udf_write_begin+0x118/0x270 [ 100.393920][ T5318] generic_perform_write+0x2e2/0x8f0 [ 100.393935][ T5318] ? __pfx_generic_perform_write+0x10/0x10 [ 100.393946][ T5318] ? generic_file_direct_write+0x385/0x3e0 [ 100.393958][ T5318] __generic_file_write_iter+0x1ae/0x230 [ 100.393970][ T5318] udf_file_write_iter+0x2ca/0x6b0 [ 100.393985][ T5318] iter_file_splice_write+0x9a1/0x10f0 [ 100.394003][ T5318] ? __pfx_iter_file_splice_write+0x10/0x10 [ 100.394017][ T5318] ? __pfx_iter_file_splice_write+0x10/0x10 [ 100.394028][ T5318] direct_splice_actor+0x101/0x160 [ 100.394042][ T5318] splice_direct_to_actor+0x53a/0xc70 [ 100.394152][ T5318] ? __pfx_direct_splice_actor+0x10/0x10 [ 100.394167][ T5318] ? __pfx_splice_direct_to_actor+0x10/0x10 [ 100.394182][ T5318] do_splice_direct+0x195/0x290 [ 100.394197][ T5318] ? __pfx_do_splice_direct+0x10/0x10 [ 100.394212][ T5318] ? __pfx_direct_file_splice_eof+0x10/0x10 [ 100.394230][ T5318] ? rw_verify_area+0x255/0x4d0 [ 100.394248][ T5318] do_sendfile+0x535/0x7d0 [ 100.394265][ T5318] ? __pfx_do_sendfile+0x10/0x10 [ 100.394277][ T5318] ? __se_sys_futex+0x3a8/0x450 [ 100.394296][ T5318] __se_sys_sendfile64+0x144/0x1a0 [ 100.394310][ T5318] ? __pfx___se_sys_sendfile64+0x10/0x10 [ 100.394325][ T5318] do_syscall_64+0x14d/0xf80 [ 100.394342][ T5318] ? trace_irq_disable+0x3b/0x150 [ 100.394358][ T5318] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.394371][ T5318] ? clear_bhb_loop+0x40/0x90 [ 100.394383][ T5318] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 100.394396][ T5318] RIP: 0033:0x7f261079c799 [ 100.394411][ T5318] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 [ 100.394421][ T5318] RSP: 002b:00007f260cbf4fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 100.394436][ T5318] RAX: ffffffffffffffda RBX: 00007f2610a15fa0 RCX: 00007f261079c799 [ 100.394445][ T5318] RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 [ 100.394452][ T5318] RBP: 00007f2610832bd9 R08: 0000000000000000 R09: 0000000000000000 [ 100.394459][ T5318] R10: 0000000800000009 R11: 0000000000000246 R12: 0000000000000000 [ 100.394466][ T5318] R13: 00007f2610a16038 R14: 00007f2610a15fa0 R15: 00007fff61e4c208 [ 100.394478][ T5318] [ 101.763953][ T4665] Bluetooth: hci0: command tx timeout [ 103.844611][ T4665] Bluetooth: hci0: command tx timeout