INFO: task hung in read_cache_folio

Status: premoderation: reported on 2026/08/03 01:55
Reported-by: syzbot+66c660ff40c9d4617c42@syzkaller.appspotmail.com
First crash: 7d05h, last: 7d05h
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in read_cache_folio origin:lts-only 1 syz inconclusive 4 60d 361d 0/3 upstream: reported syz repro on 2025/08/13 08:15
upstream INFO: task hung in read_cache_folio (6) prio:high block 1 63 2h32m 38d 0/29 upstream: reported on 2026/07/03 07:25
upstream INFO: task hung in read_cache_folio block 1 1 1100d 1100d 0/29 auto-obsoleted due to no activity on 2023/11/03 07:38
upstream INFO: task hung in read_cache_folio (4) block 1 1 534d 534d 0/29 auto-obsoleted due to no activity on 2025/05/22 08:15
upstream INFO: task hung in read_cache_folio (2) block 1 6 773d 965d 0/29 auto-obsoleted due to no activity on 2024/09/26 05:52
upstream INFO: task hung in read_cache_folio (5) prio:high block 1 48 154d 197d 0/29 auto-obsoleted due to no activity on 2026/05/23 05:03
upstream INFO: task hung in read_cache_folio (3) block 1 1 662d 662d 0/29 auto-obsoleted due to no activity on 2025/01/15 05:53

Sample crash report:
INFO: task syz.3.1095:3749 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1095      state:D stack:0     pid:3749  tgid:3748  ppid:3340   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 io_schedule+0x88/0xe0 kernel/sched/core.c:8786
 folio_wait_bit_common+0x6a4/0x940 mm/filemap.c:1356
 folio_put_wait_locked mm/filemap.c:1520 [inline]
 do_read_cache_folio+0x17c/0x610 mm/filemap.c:4060
 read_cache_folio+0x54/0x90 mm/filemap.c:4110
 read_mapping_folio include/linux/pagemap.h:1021 [inline]
 read_part_sector+0xcc/0x250 block/partitions/core.c:716
 read_lba+0x1b6/0x300 block/partitions/efi.c:248
 find_valid_gpt block/partitions/efi.c:603 [inline]
 efi_partition+0x31e/0x32b0 block/partitions/efi.c:720
 check_partition block/partitions/core.c:138 [inline]
 blk_add_partitions block/partitions/core.c:583 [inline]
 bdev_disk_changed+0x823/0x15d0 block/partitions/core.c:687
 loop_reread_partitions+0x64/0x110 drivers/block/loop.c:467
 loop_configure+0x106f/0x13a0 drivers/block/loop.c:1078
 lo_ioctl+0xa78/0x2010 drivers/block/loop.c:1520
 blkdev_ioctl+0x54b/0x690 block/ioctl.c:699
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:893
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb59919e019
RSP: 002b:00007fb599fd0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb599425fa0 RCX: 00007fb59919e019
RDX: 0000200000000080 RSI: 0000000000004c0a RDI: 0000000000000004
RBP: 00007fb59923500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb599426038 R14: 00007fb599425fa0 R15: 00007ffcd84192c8
 </TASK>
INFO: task syz.3.1095:3752 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1095      state:D stack:0     pid:3752  tgid:3748  ppid:3340   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 blk_mq_freeze_queue_wait+0xf3/0x180 block/blk-mq.c:210
 blk_freeze_queue+0xc7/0x100 block/blk-mq.c:237
 blk_mq_freeze_queue+0x19/0x30 block/blk-mq.c:246
 loop_set_status+0x1fd/0x700 drivers/block/loop.c:1232
 loop_set_status64 drivers/block/loop.c:1363 [inline]
 lo_ioctl+0xc03/0x2010 drivers/block/loop.c:1536
 blkdev_ioctl+0x54b/0x690 block/ioctl.c:699
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:893
 __x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
 x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb59919e019
RSP: 002b:00007fb599faf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fb599426090 RCX: 00007fb59919e019
RDX: 0000200000000280 RSI: 0000000000004c04 RDI: 0000000000000004
RBP: 00007fb59923500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb599426128 R14: 00007fb599426090 R15: 00007ffcd84192c8
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 200dea8a17c83f35b0a1e1238c384757fc17b797
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/03 01:55 android16-6.12 1a138e24e292 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in read_cache_folio
* Struck through repros no longer work on HEAD.