Warning: Permanently added '10.128.0.139' (ED25519) to the list of known hosts. [*] Starting reproducer... [+] Backing file created. [+] Loop device /dev/loop0 opened. [+] Loop device bound to backing file. [+] Loop device opened with O_SYNC. [ 43.155555][ T30] kauditd_printk_skb: 6 callbacks suppressed [ 43.155565][ T30] audit: type=1400 audit(1791498187.683:184): avc: denied { read write } for pid=3661 comm="syz-executor394" name="loop-control" dev="devtmpfs" ino=99 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:loop_control_device_t tclass=chr_file permissive=1 [ 43.155707][ T30] audit: type=1400 audit(1791498187.683:185): avc: denied { open } for pid=3661 comm="syz-executor394" path="/dev/loop-control" dev="devtmpfs" ino=99 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:loop_control_device_t tclass=chr_file permissive=1 [ 43.156288][ T3661] loop0: detected capacity change from 0 to 8 [ 43.156308][ T30] audit: type=1400 audit(1791498187.683:186): avc: denied { ioctl } for pid=3661 comm="syz-executor394" path="/dev/loop-control" dev="devtmpfs" ino=99 ioctlcmd=0x4c82 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:loop_control_device_t tclass=chr_file permissive=1 [ 43.156420][ T30] audit: type=1400 audit(1791498187.683:187): avc: denied { write } for pid=3661 comm="syz-executor394" name="loop0" dev="devtmpfs" ino=100 scontext=root:sysadm_r:sysadm_t tcontext=system_u:object_r:fixed_disk_device_t tclass=blk_file permissive=1 [ 44.049259][ T3666] ================================================================== [ 44.049295][ T3666] BUG: KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic [ 44.049334][ T3666] [ 44.049339][ T3666] read to 0xffff88810d4ab000 of 4096 bytes by task 12 on cpu 0: [ 44.049353][ T3666] copy_folio_from_iter_atomic+0x728/0x10a0 [ 44.049379][ T3666] generic_perform_write+0x2c4/0x490 [ 44.049404][ T3666] shmem_file_write_iter+0xc5/0xf0 [ 44.049424][ T3666] lo_rw_aio+0x6ab/0x760 [ 44.049447][ T3666] loop_process_work+0x569/0xad0 [ 44.049469][ T3666] loop_rootcg_workfn+0x22/0x30 [ 44.049492][ T3666] process_scheduled_works+0x56a/0xa50 [ 44.049530][ T3666] worker_thread+0x569/0x750 [ 44.049576][ T3666] kthread+0x223/0x270 [ 44.049597][ T3666] ret_from_fork+0x146/0x330 [ 44.049628][ T3666] ret_from_fork_asm+0x1a/0x30 [ 44.049659][ T3666] [ 44.049664][ T3666] write to 0xffff88810d4ab000 of 4096 bytes by task 3666 on cpu 1: [ 44.049680][ T3666] copy_folio_from_iter_atomic+0x282/0x10a0 [ 44.049713][ T3666] iomap_file_buffered_write+0x43a/0x960 [ 44.049889][ T3666] blkdev_write_iter+0x391/0x490 [ 44.049911][ T3666] vfs_write+0x57f/0x9a0 [ 44.049943][ T3666] __x64_sys_pwrite64+0xfd/0x150 [ 44.049980][ T3666] x64_sys_call+0x23be/0x2550 [ 44.050003][ T3666] do_syscall_64+0x112/0x360 [ 44.050025][ T3666] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 44.050045][ T3666] [ 44.050050][ T3666] Reported by Kernel Concurrency Sanitizer on: [ 44.050077][ T3666] CPU: 1 UID: 0 PID: 3666 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 44.050106][ T3666] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 44.050120][ T3666] ================================================================== [ 44.559521][ T3667] ================================================================== [ 44.559549][ T3667] BUG: KCSAN: data-race in xas_find_marked / xas_set_mark [ 44.559569][ T3667] [ 44.559572][ T3667] write to 0xffff8881004c4134 of 4 bytes by task 3668 on cpu 0: [ 44.559582][ T3667] xas_set_mark+0x12b/0x140 [ 44.559595][ T3667] __folio_start_writeback+0x16b/0x370 [ 44.559614][ T3667] __block_write_full_folio+0x526/0x8d0 [ 44.559632][ T3667] block_write_full_folio+0x2c1/0x2e0 [ 44.559649][ T3667] blkdev_writepages+0x88/0x100 [ 44.559662][ T3667] do_writepages+0x1b9/0x300 [ 44.559678][ T3667] file_write_and_wait_range+0x178/0x2f0 [ 44.559691][ T3667] blkdev_fsync+0x4a/0xa0 [ 44.559703][ T3667] vfs_fsync_range+0xc5/0xe0 [ 44.559717][ T3667] generic_write_sync+0x10a/0x150 [ 44.559730][ T3667] blkdev_write_iter+0x458/0x490 [ 44.559742][ T3667] vfs_write+0x57f/0x9a0 [ 44.559757][ T3667] __x64_sys_pwrite64+0xfd/0x150 [ 44.559774][ T3667] x64_sys_call+0x23be/0x2550 [ 44.559789][ T3667] do_syscall_64+0x112/0x360 [ 44.559802][ T3667] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 44.559814][ T3667] [ 44.559817][ T3667] read to 0xffff8881004c4134 of 4 bytes by task 3667 on cpu 1: [ 44.559826][ T3667] xas_find_marked+0x602/0x650 [ 44.559843][ T3667] filemap_get_folios_tag+0xf7/0x400 [ 44.559932][ T3667] writeback_iter+0x48f/0x7c0 [ 44.559950][ T3667] blkdev_writepages+0x69/0x100 [ 44.559962][ T3667] do_writepages+0x1b9/0x300 [ 44.559978][ T3667] file_write_and_wait_range+0x178/0x2f0 [ 44.559996][ T3667] blkdev_fsync+0x4a/0xa0 [ 44.560008][ T3667] __x64_sys_fsync+0xc3/0x120 [ 44.560024][ T3667] x64_sys_call+0x1d2b/0x2550 [ 44.560039][ T3667] do_syscall_64+0x112/0x360 [ 44.560052][ T3667] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 44.560064][ T3667] [ 44.560067][ T3667] value changed: 0x05000021 -> 0x03000021 [ 44.560076][ T3667] [ 44.560079][ T3667] Reported by Kernel Concurrency Sanitizer on: [ 44.560086][ T3667] CPU: 1 UID: 0 PID: 3667 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 44.560101][ T3667] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 44.560109][ T3667] ================================================================== [ 45.961012][ T3665] ================================================================== [ 45.961050][ T3665] BUG: KCSAN: data-race in __xa_set_mark / xas_find_marked [ 45.961084][ T3665] [ 45.961089][ T3665] write to 0xffff8881004c4134 of 4 bytes by task 3662 on cpu 0: [ 45.961104][ T3665] __xa_set_mark+0x172/0x1a0 [ 45.961133][ T3665] __folio_mark_dirty+0x43f/0x520 [ 45.961168][ T3665] mark_buffer_dirty+0x120/0x1f0 [ 45.961197][ T3665] block_commit_write+0x120/0x1d0 [ 45.961224][ T3665] block_write_end+0x56/0xc0 [ 45.961253][ T3665] iomap_write_end+0x1b2/0x3e0 [ 45.961286][ T3665] iomap_file_buffered_write+0x458/0x960 [ 45.961318][ T3665] blkdev_write_iter+0x391/0x490 [ 45.961343][ T3665] vfs_write+0x57f/0x9a0 [ 45.961374][ T3665] __x64_sys_pwrite64+0xfd/0x150 [ 45.961406][ T3665] x64_sys_call+0x23be/0x2550 [ 45.961430][ T3665] do_syscall_64+0x112/0x360 [ 45.961450][ T3665] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 45.961470][ T3665] [ 45.961476][ T3665] read to 0xffff8881004c4134 of 4 bytes by task 3665 on cpu 1: [ 45.961493][ T3665] xas_find_marked+0x602/0x650 [ 45.961520][ T3665] filemap_get_folios_tag+0xf7/0x400 [ 45.961549][ T3665] file_write_and_wait_range+0x20c/0x2f0 [ 45.961573][ T3665] blkdev_fsync+0x4a/0xa0 [ 45.961595][ T3665] __x64_sys_fsync+0xc3/0x120 [ 45.961623][ T3665] x64_sys_call+0x1d2b/0x2550 [ 45.961650][ T3665] do_syscall_64+0x112/0x360 [ 45.961674][ T3665] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 45.961696][ T3665] [ 45.961701][ T3665] value changed: 0x02000021 -> 0x05000021 [ 45.961714][ T3665] [ 45.961718][ T3665] Reported by Kernel Concurrency Sanitizer on: [ 45.961739][ T3665] CPU: 1 UID: 0 PID: 3665 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 45.961762][ T3665] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 45.961774][ T3665] ================================================================== [ 46.720999][ T30] audit: type=1400 audit(1791498191.243:188): avc: denied { write } for pid=3675 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 46.779169][ T30] audit: type=1400 audit(1791498191.303:189): avc: denied { write } for pid=3686 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 47.825247][ T30] audit: type=1400 audit(1791498192.353:190): avc: denied { write } for pid=3689 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 47.889871][ T30] audit: type=1400 audit(1791498192.413:191): avc: denied { write } for pid=3700 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 47.993044][ T30] audit: type=1400 audit(1791498192.523:192): avc: denied { write } for pid=3703 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 48.013148][ T30] audit: type=1400 audit(1791498192.533:193): avc: denied { write } for pid=3714 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 48.150872][ T3665] ================================================================== [ 48.150909][ T3665] BUG: KCSAN: data-race in __xa_set_mark / file_write_and_wait_range [ 48.150947][ T3665] [ 48.150953][ T3665] write to 0xffff8881004c4134 of 4 bytes by task 3662 on cpu 0: [ 48.150971][ T3665] __xa_set_mark+0x172/0x1a0 [ 48.150996][ T3665] __folio_mark_dirty+0x43f/0x520 [ 48.151033][ T3665] mark_buffer_dirty+0x120/0x1f0 [ 48.151058][ T3665] block_commit_write+0x120/0x1d0 [ 48.151085][ T3665] block_write_end+0x56/0xc0 [ 48.151112][ T3665] iomap_write_end+0x1b2/0x3e0 [ 48.151145][ T3665] iomap_file_buffered_write+0x458/0x960 [ 48.151178][ T3665] blkdev_write_iter+0x391/0x490 [ 48.151200][ T3665] vfs_write+0x57f/0x9a0 [ 48.151232][ T3665] __x64_sys_pwrite64+0xfd/0x150 [ 48.151266][ T3665] x64_sys_call+0x23be/0x2550 [ 48.151294][ T3665] do_syscall_64+0x112/0x360 [ 48.151316][ T3665] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 48.151340][ T3665] [ 48.151346][ T3665] read to 0xffff8881004c4134 of 4 bytes by task 3665 on cpu 1: [ 48.151363][ T3665] file_write_and_wait_range+0x130/0x2f0 [ 48.151388][ T3665] blkdev_fsync+0x4a/0xa0 [ 48.151412][ T3665] __x64_sys_fsync+0xc3/0x120 [ 48.151437][ T3665] x64_sys_call+0x1d2b/0x2550 [ 48.151459][ T3665] do_syscall_64+0x112/0x360 [ 48.151478][ T3665] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 48.151497][ T3665] [ 48.151500][ T3665] value changed: 0x02000021 -> 0x01000021 [ 48.151513][ T3665] [ 48.151517][ T3665] Reported by Kernel Concurrency Sanitizer on: [ 48.151528][ T3665] CPU: 1 UID: 0 PID: 3665 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 48.151555][ T3665] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 48.151569][ T3665] ================================================================== [ 48.622254][ T30] audit: type=1400 audit(1791498193.143:194): avc: denied { write } for pid=3717 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 48.692336][ T30] audit: type=1400 audit(1791498193.213:195): avc: denied { write } for pid=3728 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 48.864309][ T30] audit: type=1400 audit(1791498193.383:196): avc: denied { write } for pid=3731 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 48.935349][ T30] audit: type=1400 audit(1791498193.463:197): avc: denied { write } for pid=3742 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.098616][ T30] audit: type=1400 audit(1791498193.623:198): avc: denied { write } for pid=3745 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.122773][ T30] audit: type=1400 audit(1791498193.633:199): avc: denied { write } for pid=3756 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.236371][ T30] audit: type=1400 audit(1791498193.763:200): avc: denied { write } for pid=3759 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.260441][ T30] audit: type=1400 audit(1791498193.773:201): avc: denied { write } for pid=3770 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.361163][ T30] audit: type=1400 audit(1791498193.883:202): avc: denied { write } for pid=3773 comm="dhcpcd-run-hook" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.413936][ T30] audit: type=1400 audit(1791498193.943:203): avc: denied { write } for pid=3784 comm="rm" name="hook-state" dev="tmpfs" ino=486 scontext=system_u:system_r:dhcpc_t tcontext=system_u:object_r:tmpfs_t tclass=dir permissive=1 [ 49.492840][ T3664] ================================================================== [ 49.492880][ T3664] BUG: KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic [ 49.492929][ T3664] [ 49.493009][ T3664] read to 0xffff88810d4ab000 of 4096 bytes by task 12 on cpu 0: [ 49.493053][ T3664] copy_folio_from_iter_atomic+0x728/0x10a0 [ 49.493087][ T3664] generic_perform_write+0x2c4/0x490 [ 49.493115][ T3664] shmem_file_write_iter+0xc5/0xf0 [ 49.493134][ T3664] lo_rw_aio+0x6ab/0x760 [ 49.493153][ T3664] loop_process_work+0x569/0xad0 [ 49.493171][ T3664] loop_rootcg_workfn+0x22/0x30 [ 49.493189][ T3664] process_scheduled_works+0x56a/0xa50 [ 49.493216][ T3664] worker_thread+0x569/0x750 [ 49.493241][ T3664] kthread+0x223/0x270 [ 49.493258][ T3664] ret_from_fork+0x146/0x330 [ 49.493286][ T3664] ret_from_fork_asm+0x1a/0x30 [ 49.493313][ T3664] [ 49.493320][ T3664] write to 0xffff88810d4ab000 of 4096 bytes by task 3664 on cpu 1: [ 49.493337][ T3664] copy_folio_from_iter_atomic+0x282/0x10a0 [ 49.493364][ T3664] iomap_file_buffered_write+0x43a/0x960 [ 49.493409][ T3664] blkdev_write_iter+0x391/0x490 [ 49.493434][ T3664] vfs_write+0x57f/0x9a0 [ 49.493483][ T3664] __x64_sys_pwrite64+0xfd/0x150 [ 49.493513][ T3664] x64_sys_call+0x23be/0x2550 [ 49.493535][ T3664] do_syscall_64+0x112/0x360 [ 49.493558][ T3664] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 49.493581][ T3664] [ 49.493586][ T3664] Reported by Kernel Concurrency Sanitizer on: [ 49.493598][ T3664] CPU: 1 UID: 0 PID: 3664 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 49.493641][ T3664] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 49.493654][ T3664] ================================================================== [ 50.419776][ T3669] ================================================================== [ 50.419812][ T3669] BUG: KCSAN: data-race in __xa_set_mark / xas_find_marked [ 50.419851][ T3669] [ 50.419858][ T3669] write to 0xffff8881004c4134 of 4 bytes by task 3664 on cpu 0: [ 50.419875][ T3669] __xa_set_mark+0x172/0x1a0 [ 50.419895][ T3669] __folio_mark_dirty+0x43f/0x520 [ 50.419913][ T3669] mark_buffer_dirty+0x120/0x1f0 [ 50.419929][ T3669] block_commit_write+0x120/0x1d0 [ 50.419945][ T3669] block_write_end+0x56/0xc0 [ 50.419961][ T3669] iomap_write_end+0x1b2/0x3e0 [ 50.419978][ T3669] iomap_file_buffered_write+0x458/0x960 [ 50.419995][ T3669] blkdev_write_iter+0x391/0x490 [ 50.420008][ T3669] vfs_write+0x57f/0x9a0 [ 50.420025][ T3669] __x64_sys_pwrite64+0xfd/0x150 [ 50.420042][ T3669] x64_sys_call+0x23be/0x2550 [ 50.420068][ T3669] do_syscall_64+0x112/0x360 [ 50.420082][ T3669] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.420095][ T3669] [ 50.420098][ T3669] read to 0xffff8881004c4134 of 4 bytes by task 3669 on cpu 1: [ 50.420107][ T3669] xas_find_marked+0x602/0x650 [ 50.420121][ T3669] filemap_get_folios_tag+0xf7/0x400 [ 50.420135][ T3669] file_write_and_wait_range+0x20c/0x2f0 [ 50.420149][ T3669] blkdev_fsync+0x4a/0xa0 [ 50.420164][ T3669] __x64_sys_fsync+0xc3/0x120 [ 50.420178][ T3669] x64_sys_call+0x1d2b/0x2550 [ 50.420192][ T3669] do_syscall_64+0x112/0x360 [ 50.420204][ T3669] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 50.420216][ T3669] [ 50.420218][ T3669] value changed: 0x00000021 -> 0x07000021 [ 50.420225][ T3669] [ 50.420227][ T3669] Reported by Kernel Concurrency Sanitizer on: [ 50.420234][ T3669] CPU: 1 UID: 0 PID: 3669 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 50.420249][ T3669] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 50.420256][ T3669] ================================================================== [ 52.874044][ T3668] ================================================================== [ 52.874074][ T3668] BUG: KCSAN: data-race in file_write_and_wait_range / xas_set_mark [ 52.874092][ T3668] [ 52.874096][ T3668] write to 0xffff8881004c4134 of 4 bytes by task 3662 on cpu 1: [ 52.874106][ T3668] xas_set_mark+0x12b/0x140 [ 52.874119][ T3668] tag_pages_for_writeback+0xe3/0x2e0 [ 52.874145][ T3668] writeback_iter+0x332/0x7c0 [ 52.874170][ T3668] blkdev_writepages+0x69/0x100 [ 52.874183][ T3668] do_writepages+0x1b9/0x300 [ 52.874199][ T3668] file_write_and_wait_range+0x178/0x2f0 [ 52.874212][ T3668] blkdev_fsync+0x4a/0xa0 [ 52.874224][ T3668] vfs_fsync_range+0xc5/0xe0 [ 52.874238][ T3668] generic_write_sync+0x10a/0x150 [ 52.874251][ T3668] blkdev_write_iter+0x458/0x490 [ 52.874263][ T3668] vfs_write+0x57f/0x9a0 [ 52.874279][ T3668] __x64_sys_pwrite64+0xfd/0x150 [ 52.874297][ T3668] x64_sys_call+0x23be/0x2550 [ 52.874313][ T3668] do_syscall_64+0x112/0x360 [ 52.874326][ T3668] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 52.874339][ T3668] [ 52.874343][ T3668] read to 0xffff8881004c4134 of 4 bytes by task 3668 on cpu 0: [ 52.874352][ T3668] file_write_and_wait_range+0x130/0x2f0 [ 52.874365][ T3668] blkdev_fsync+0x4a/0xa0 [ 52.874376][ T3668] vfs_fsync_range+0xc5/0xe0 [ 52.874390][ T3668] generic_write_sync+0x10a/0x150 [ 52.874403][ T3668] blkdev_write_iter+0x458/0x490 [ 52.874416][ T3668] vfs_write+0x57f/0x9a0 [ 52.874432][ T3668] __x64_sys_pwrite64+0xfd/0x150 [ 52.874449][ T3668] x64_sys_call+0x23be/0x2550 [ 52.874464][ T3668] do_syscall_64+0x112/0x360 [ 52.874477][ T3668] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 52.874489][ T3668] [ 52.874491][ T3668] value changed: 0x01000021 -> 0x02000021 [ 52.874498][ T3668] [ 52.874500][ T3668] Reported by Kernel Concurrency Sanitizer on: [ 52.874509][ T3668] CPU: 0 UID: 0 PID: 3668 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 52.874524][ T3668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 52.874532][ T3668] ================================================================== [ 53.313468][ T3668] ================================================================== [ 53.313512][ T3668] BUG: KCSAN: data-race in copy_folio_from_iter_atomic / copy_folio_from_iter_atomic [ 53.313558][ T3668] [ 53.313564][ T3668] read to 0xffff88810d4ab000 of 4096 bytes by task 51 on cpu 1: [ 53.313582][ T3668] copy_folio_from_iter_atomic+0x728/0x10a0 [ 53.313613][ T3668] generic_perform_write+0x2c4/0x490 [ 53.313651][ T3668] shmem_file_write_iter+0xc5/0xf0 [ 53.313668][ T3668] lo_rw_aio+0x6ab/0x760 [ 53.313682][ T3668] loop_process_work+0x569/0xad0 [ 53.313694][ T3668] loop_rootcg_workfn+0x22/0x30 [ 53.313706][ T3668] process_scheduled_works+0x56a/0xa50 [ 53.313725][ T3668] worker_thread+0x569/0x750 [ 53.313742][ T3668] kthread+0x223/0x270 [ 53.313757][ T3668] ret_from_fork+0x146/0x330 [ 53.313778][ T3668] ret_from_fork_asm+0x1a/0x30 [ 53.313792][ T3668] [ 53.313796][ T3668] write to 0xffff88810d4ab000 of 4096 bytes by task 3668 on cpu 0: [ 53.313805][ T3668] copy_folio_from_iter_atomic+0x282/0x10a0 [ 53.313822][ T3668] iomap_file_buffered_write+0x43a/0x960 [ 53.313839][ T3668] blkdev_write_iter+0x391/0x490 [ 53.313852][ T3668] vfs_write+0x57f/0x9a0 [ 53.313868][ T3668] __x64_sys_pwrite64+0xfd/0x150 [ 53.313885][ T3668] x64_sys_call+0x23be/0x2550 [ 53.313907][ T3668] do_syscall_64+0x112/0x360 [ 53.313927][ T3668] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 53.313945][ T3668] [ 53.313948][ T3668] Reported by Kernel Concurrency Sanitizer on: [ 53.313958][ T3668] CPU: 0 UID: 0 PID: 3668 Comm: syz-executor394 Not tainted syzkaller #0 PREEMPT(lazy) [ 53.313979][ T3668] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 [ 53.313990][ T3668] ==================================================================